n | a(n) |
---|---|
1 | 1 |
2 | 1 |
3 | 2 |
4 | 6 |
5 | 21 |
6 | 78 |
7 | 297 |
8 | 1143 |
9 | 4419 |
10 | 17118 |
11 | 66366 |
12 | 257391 |
13 | 998406 |
14 | 3873015 |
15 | 15024609 |
16 | 58285737 |
17 | 226111986 |
18 | 877174110 |
19 | 3402893997 |
20 | 13201132950 |
21 | 51212274057 |
22 | 198672129783 |
23 | 770725711035 |
24 | 2989941920334 |
25 | 11599136512038 |
26 | 44997518922327 |
27 | 174562710686622 |
[1,1,2,6,21,78,297,1143,4419,17118,66366,257391, 998406,3873015,15024609,58285737,226111986, 877174110,3402893997,13201132950,51212274057, 198672129783,770725711035,2989941920334, 11599136512038,44997518922327,174562710686622] |